src/share/vm/memory/padded.hpp

*** 31,41 ****
  // Bytes needed to pad type to avoid cache-line sharing; alignment should be the
  // expected cache line size (a power of two).  The first addend avoids sharing
  // when the start address is not a multiple of alignment; the second maintains
  // alignment of starting addresses that happen to be a multiple.
  #define PADDING_SIZE(type, alignment)                           \
!   ((alignment) + align_size_up_(sizeof(type), alignment))
  
  // Templates to create a subclass padded to avoid cache line sharing.  These are
  // effective only when applied to derived-most (leaf) classes.
  
  // When no args are passed to the base ctor.
--- 31,41 ----
  // Bytes needed to pad type to avoid cache-line sharing; alignment should be the
  // expected cache line size (a power of two).  The first addend avoids sharing
  // when the start address is not a multiple of alignment; the second maintains
  // alignment of starting addresses that happen to be a multiple.
  #define PADDING_SIZE(type, alignment)                           \
!   ((alignment) + align_up_(sizeof(type), (alignment)))
  
  // Templates to create a subclass padded to avoid cache line sharing.  These are
  // effective only when applied to derived-most (leaf) classes.
  
  // When no args are passed to the base ctor.
*** 66,76 ****
  template <class T>
  class PaddedEndImpl<T, /*pad_size*/ 0> : public T {
    // No padding.
  };
  
! #define PADDED_END_SIZE(type, alignment) (align_size_up_(sizeof(type), alignment) - sizeof(type))
  
  // More memory conservative implementation of Padded. The subclass adds the
  // minimal amount of padding needed to make the size of the objects be aligned.
  // This will help reducing false sharing,
  // if the start address is a multiple of alignment.
--- 66,76 ----
  template <class T>
  class PaddedEndImpl<T, /*pad_size*/ 0> : public T {
    // No padding.
  };
  
! #define PADDED_END_SIZE(type, alignment) (align_up_(sizeof(type), (alignment)) - sizeof(type))
  
  // More memory conservative implementation of Padded. The subclass adds the
  // minimal amount of padding needed to make the size of the objects be aligned.
  // This will help reducing false sharing,
  // if the start address is a multiple of alignment.